Boiler



April 28, 1931. w. N. VAN FLEET BOILER iginal Filed June 6, 1927 3 Sheets-awe:

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ATTORNEY w. N. VAN FLEET 1,803,155

BOILER iginal Filed June 6, 1927 3 Sheets-Sheet 2 April 28, 1931.

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rllltlitllll WITNESSES April 28, 1931. w. N. VAN FLEET BOILER Original Filed June 6, 1927 3 Sheets-Sheet 3 INVEN'IIOR Wizlzer 1V. Vizm Fieei:

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Patented Apr. 28, 1931 UNITED psT T' s PATENT omen WALTER N. VAN FLEET, OF BOONTON, NEW JERSEY, ASSIGNOR T SHARP & VAN'FLEET MANUFACTURING CO.,' INC., A CORPORATION OF NEW JERSEX y Application filed J'unefi, 1927, se t; mer e.- Renewe d september 19, i930.

An object of the present invention is to may be generated thereinwithin afcomparatively small amount of time, and -upon-the heatin of only a 'small quantity of the water containedin the boiler. v K

In the ordinary boiler construction, the water which is first heated effects a general circulation in thegwater. chambers of the boiler and substantially the-entire body of water must be heated befores'tea'm may be In-accordance with the present invention, the boiler is preferably provided with a 'relatively thin crown sheet of water communicating by a vertical 'upflow pipe with a steam chamber, the endof the upflow pipe being arranged well above the water level,-and the pipe being of such crosssectional areathat the boiling water therein will-not bubble over." [By virtue of this construction, the main body of water in the boiler 'i'ssubstantially'inert', and as steam-"passes fromthetop of the 'upflow pipe, a corresponding amount of water will flow into thebottom' of the crown sheet inlet from a suitable reservoir. The device is in effect a'dead' water boiler with no circulation of water occurring except such circulation as is necessaryto replace the water'which has boiled oifas steam. i I

Other objects of the invention -are to provide aboiler of simple, practical construction which will-be rugged, durable and efficient in use, and well" suited to the requirements of economical manufacture and operation.

C With the above noted and other objectsin view, the invention consists inflcertain novel features of construction and combinations and arrangements of parts, as will bemore fully hereinafter. set forth and pointed out in theclaims. The invention may be'more fully understood from the following description in connection with the accompanying drawings, wherein-' Fig, 1 is a transverse vertical sectional view through a boiler constructed in accordance with the present invention. f

' -Fig. 2 is a longitudinal vertical sectional view therethrough on the line 22 of Fig. 1. Figs. 3 and 4 are sectional plan views on the lines 33 and 44 respectively of Fig. provide a boiler so constructed thatste'am 5 is a fragmentary vertical sectional VlGW illustrating a slight, modification in which the'boiler is used in connection with a hot water instead of a steam system. f

Many details of the boiler mountingywater level regulating means and similar structural details having no particular bearing on the present invention have been omitted for the sake of clarity, and I haveillustrated simply the water chambers, firebox and flue spaces. the drawings I have used the reference numeral lOto designate the hollow front wall of the boiler, and the reference numeral 11 to designate the hollow rear wall thereof. Wall is provided witha lower water space 10a below the fire door 12 and with an upper water space-10b vabove the fire door. Corresponding water chambers 11a and 11?) are provided inthe rear'wall, this wall simply being open at suitable points to communicate with the flue outlet 13, and to provide a cleaningopening 14.

The hollow side walls 15 of the boiler are also filled with water and communicate with the front and rear walls through passages .16. Bridging the firebox are crown chambers 21' into ,which waterfrom the hollow side walls of the boiler flows. To enter the crown chambers from the side water spaces, the'water must flow around the lower endsof depending partition-forming aprons 22 arranged in'the side water spaces and'terminating near the lower ends of the latter.

Also connecting the side water spaces at a series of: points above the crown chambers 21 are horizontally extending water chamber's23. t. e

Rising from each crown chamber 21 is a vertical pipe 24 provided with an enlarged upper end 25 terminating well abovethe water level in the boiler and opening into a steam chamber 26. provided with anysuitable number of steam off-takes 27. The cross sectional area v of therpipes' 24 is sufiicient to prevent 'anyYp ercolator effect, or in other words, any water boiling out of the upper ends of -the'pipes,but-' the diameterof the pipes 24 isless than the cross sectional area of CII chambers 21, .pipev 24 and cross .c'ha1nberl28 are arranged side by side, so that the boiler is substantially a built-up construction, and the flow through the various sections through the openings '16 above described. ()bviouslythese sections might be unconnectedifor water flow and-separate water inlets might be provided for all of themif desired In operatiornthe water flows into the water spaces 23 downwardly into the hollow front .and side walls of .theboiler, around'the lower ends of the aprons 22, filling the crown sheets and the pipes 24 until the desired water level is reached. U V w The heat transmit-ted to the water in the crown sheetsand crown-chambers 21 is of course much more intense than the heat :directly transmitted to any other parts of the boiler. In consequence, long before the "rest ofthe boiler water is heated, steam will be escaping from the upper ends of the pipes 24 and passing out through the outlets 27. The water which leaves the pipes 24 in the form of steam, is replacedby water flowing into the crown chambers around the lower endsofthe partitions or aprons 22. Thus, themainbody of waterin the boiler is sub stantially inert, the flow being onlysuflicient tomaintain a constant water level andlto replace thew ater which is lost in the form of steam.

, It will be noticedthatthe side water: chambers within the hollow walls 15 also communicate with the. common steamchamber26fin order to prevent any possibilityof steam being trapped inthe system when all of the water in-the boiler is hot. r

By arranging the crown chambers 21, the side chambers, andthecross chambers 23 as separate units and spacing them slightly apart,,the hot flue gases may flow' betweenthe various sections and transmit heatdirectlyto thewater in all of'the cross'chambers and side chambers. The arrangement of suchfiue passages is best seen in-Fig. 2 wherein it will be-noted that substantially all of the water chambers of'the boiler are exposed ona ll sides to'the. heat of the hot gases from 'the firebox anda very large eifectiveiheating surface is had. 7 r

' In Fig. 5 :I have illustrated a-slightmodification of the invention in which'the boiler is used for circulating'hot water, andin which through the pipes 24a.

Obviously, various changes and alterations might be made in the general form and arrangementlofthe parts-described without departing from the invention. Hence I do not wish to limit myself to the precise details set forth, but shall consider myself at liberty to make such changes and'alterations as fairly fall'within the spiritand scope ofthe gappended claims. g

I claim: I '1. Aboiler including a'firebox, water spaces at the front and side walls-of'the firebox, a top steam chamber communicating with the water spaces andhaving asteam outlet, crown chambers extending across thetop-of the-firebox and connecting theside water spaees,-sa id crownchamb ers communicating with the. side water spaces onlyat the lower ends of thelatter, vertical pipes rising from the crown chambers andtermin'ating inthe steam chamber well above the water level'in the=boiler-,

said pipesbeing of sufiicient cross sectional area .to prevent the hot water from boiling out ofthe top there'ofand communicating with the water inthe boiler only through the crownchambers. v a I a 2;,-;A boiler including a firebox, water spacesat-the frontand side walls ofthe fira box, a top .steam chamber communicating with the water' sp aces'andihaving a-steam outlet, crown chambers extending acrossthe top of-the firebox and connecting the, side water spaces,-.said crown chambers communicating with the side waterspaces onlyat the; lower ends of thelatter, vertical pipes rising from .thecrow-n chambers and terminating'in the steam chamber well-above the water level in the boiler, said pipes being ofsufiicient. cross sectional area to preventthev hot water from boiling out of the top thereof and commun cating with the water in. the boiler only through the crown chambers,the side :water spacesincluding-vertical.partitions-terminating near thei r1 lowerends; and. around which lwater must-flowfrom the side waterspace's toreach the-crown: chambers. I

3. A boiler including a firebox, water spaces: at-the. front and side? walls; of the lire box, atop steam chamber communicating with the water spaces and having-a-steam out let, crown chambers extending across the top of the firebox and-connecting the side water spaces, said crown chambers I communicating with the side water-spaces. only at the'lower ends otthe -latter, vertical pipes rising from the crown chambersfand terminating: in the steam chamber 'well above the water level in chambers.

WALTER N. VAN 

